Analysis Method for the Production Data of Water Drive Gas Reservoirs and Its Application

doi:10.11885/j.issn.1674-5086.2018.12.11.01

Abstract

Abstract: Conventional production data analysis techniques are primarily applied to closed gas reservoirs having constant volume, but are not applicable to water drive gas reservoirs. Based on the unstable seepage theory, a seepage model for water drive gas reservoirs was established considering the water encroachment characteristics of gas reservoirs. Subsequently, the response solution of the unstable production of water drive gas reservoirs was derived using Laplace transform, and the typical curves of modern production-decline analysis were computed and plotted. From the results, four typical flow stages were categorized according to the characteristics of the curves. In addition, the effects of dimensionless water encroachment influx and time on a typical production-decline curve were discussed. Combined with modern production data analysis technology, a quantification method exploiting the relationship between the production and the pressure of gas wells was proposed for the quantitative evaluation of the intensity and starting time of water encroachment, as well as calculation of the dynamic reserve, permeability and other parameters of the gas reservoir. The results of the field production data analysis showed that this method was able to meet the engineering requirements of the dynamic analysis for water drive gas reservoir.

Key words: seepage model, water drive, production-decline curve, production data analysis, dynamic reserve

CLC Number:

TE341

ZHENG Yongjian, DUAN Yonggang, WEI Mingqiang. Analysis Method for the Production Data of Water Drive Gas Reservoirs and Its Application[J]. 西南石油大学学报(自然科学版), 2019, 41(4): 99-106.

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